SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c52ec64cdad72cd89cb74c4ef72f2de3c8257a9bb3430af5baeeaea0b3bb9f' 
  AND token = 'mB0po4/fo7HVq6IrsGzgBp+XaaGmPWnvK2UJ7DQFrWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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