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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c4a2cf5696b064350db378e1a27fd19ceea17bbfc97461f4cbd81d14d29c26' 
  AND token = 'Wiixhzoo2iLzUuXJRMDWvRUdKXOUEb+t6Oz1U1+JW0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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