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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e95aa02b5137e44f46a88773daad780abdf847641fe6fbbbdb92e78383d9cdd' 
  AND token = 'Nrq8uBOAhNMt8wEKM9Ry0Z8D2Vg0GjGhZ9pIgQFtoag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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