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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad986dd75980519212b9797e1d3c519107dd240802b6ce87be4a8198d6ff213' 
  AND token = 'aoWvDrlAlSrqtmy4EuVdJeqbBpSx059XhN9A8B8U4HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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