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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7813e2a64ff02c36a41b6e3ed1627773f08ef5c5a583141a6e4d691ad41269' 
  AND token = 'WQIoe6T6SQvQQONma70og+/RUdWxJs4IWKu/dvYHNbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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