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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7b1e7ba676fc41379d726f0fb5e5f6a94b0caaa7f27c61b2653da51d07039e' 
  AND token = 'J6BmAe5r8Einsye7ae3YJQWoduuvrKfd2cpZgEX7GIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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