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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71809328cf9632bb8d32bb60741687704f7020db02fd7829a81467ea878a8c03' 
  AND token = 'TD3f/uOBc7q1IBbNsMH0w00MII82cL/0PkNhGqPsdKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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