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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137e3a63d63b86ecdc41db9f1a3d72d975f7029a910aebcd6877976a485b4d9a' 
  AND token = '8YRr6QfVUOESdogvI7Zz7CKpY0Vey9736Gm98R7bEk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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