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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a621d2746e11a53f6ed31064abd1b3b2c1e666a50ce2a246593884f7b4a6b4' 
  AND token = 'dOOhkcDiVEn7l3RzlKeivb3LlDLesFJfQNVOrNNWG84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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