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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df75f0e0d917fcbd657223c927d14c7d0dfb75f2d1afe67f9e6a60f3ab86de1' 
  AND token = 'Yet5ALqYiiyFFKna7onKb8JN8VTvJ8rrrdBU0bwjnLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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