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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69756f838a915b13bc81868ce3771ed064ca943375cddcb0772ddf4e5114d6ce' 
  AND token = 'YMohCKTrM0+VQrZDvAua/DMKiwQu0HSuo7Ce7TU9Ixg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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