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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9629374b0cd8cd2acecc0e8398eb03a127a9bff9b237ab8f4cb4b48981d0b2a6' 
  AND token = 'aydG410PtJjBfmRYigHmBQJr5QS7TUl3ylfIPVip590=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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