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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff23989eda687160283c997de10cc27fb6fb316cba1631aea920be027196c28a' 
  AND token = 'lsc8HDBQyZpF7+vCHpTkjmojHNASW61th4p6zLzG1Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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