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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b47c8d6da1524a8bbeeca61822798183e59a0572a1ce1994da9446793e08da8' 
  AND token = 'ENYISnv0j+W9psvUkuc6LwqDz+zyzQ7xPERniWO5fkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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