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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b327c0008ddc8c4246d9aa0615e9ec42450da8a66916e7664b12af0f8cefe6' 
  AND token = 'AwdlDlp82F0gSswta9mW4OH5wh7G4c/aCBTqSgOB89A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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