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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947c9da9f4f896b7141cc456ff58010b45df917c835fe3031fdd5bbd3dfb5a6f' 
  AND token = 'N36/txLq+qhZJ1osKEq8Bl2LfbNdGlgKx+q3i3A67oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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