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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d4f66d4cabe25fdcdd36470ec2f04ab5f5e694ef49c12f1341b0e790de0a7d' 
  AND token = 'Wb33IZjeFrPGJ3H4raDhpPEBfeJkMMqeXymRG208i+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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