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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c672a9f0862d27ddb068c908459eb44db89f8be0bb3b49508ec388cde01abafb' 
  AND token = 'rmRKSjDA056WC5F5q5AXIZPRufIWMJRDFdJ5fmIGOb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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