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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fab549912042c9dc150b13e17e6cd7b5548c37aab0403ded60b6a9df52b4b8' 
  AND token = 'g341r5vZ7kyBj7SWNv63Nj53jlqoEAyEkiFCbUyMPws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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