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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af94ac08adcfb9265cd02a4d5fe8e3badc7a8f01b96111780ea689ca22948bcd' 
  AND token = 'AmZ01nXjJDnoo6u1JPW+0INW+AmqH9eohrFocshMoyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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