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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '126e38260f0bfa5b736ea1e3947270c0d6e0e80a35ff7a894a59cf46f1e793d5' 
  AND token = 'UPKbd/aeIt+Sc40CIWasPA/lXSQIGHnjdEAucTy1918=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00082

JSON explain

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