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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced70b92dbdbcfc87b22458a53bb82bfbf8e303949d8484446d72515509ee734' 
  AND token = 'FBAxPKJ9D4UH7eI1Fdbck1V8ABNw1bcneN2RGAAVTEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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