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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b7f05deb6a49f03e781fa6d5e2d022c2c7b4966eb2b60fd988d7a943a8fb05' 
  AND token = 'pdKstdR8vVDdV4KlaSFr4E8jpxMB0COzqYU6uWSztjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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