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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde249da47c4ccd848ee0555f1e5526d41bd972df469df6566d62a2dc701ca63' 
  AND token = 'v/9La7xrIRAnVdvwd2OPNEFk0NR4pPoUnYP9EhgKnlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}