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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f69191399fa16c759245c9d1889a13751dfa7a4b551209b60d25ea5b522a53' 
  AND token = 'vO8WP2CrUl6pnYlvOijDXQMI7qyMAi9EK3hMt6+RZG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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