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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713cbba0e79b5b2b613babc00a55701fd56136268528ac08522d9f6ed31ba77e' 
  AND token = 'KNHvTlIavmVv38hu+gP9GIca0TCOdjGhgDJZ3w8+L5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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