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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20571fd9692cff9c4dc21b613567d903afaa3a4fe7158a2a2ec5ad1d533625c7' 
  AND token = '8XtKeX8lgnSRzXaMV7qwhMlBneuslomObeG5/vyD5gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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