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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1845e7b7a45237f31e488cc28dfa183c280d78a37cfbef8d8017ac022dda2124' 
  AND token = 'eF6t5fdzw3yQQ3PuZX6IyrsPZSpxJdwaSdTP384RNW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00142

JSON explain

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