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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f49e1cebe5a63a2dc5c5203525fc0e7bd6578cf782a9f6f2f379952fd54eff' 
  AND token = 'Pgpn4cwV8Veoh7wFCKQjhCa9G7OAbDE3MZiwou5u1Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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