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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba7d2ac9b2663ca257a6ce77cca4dfc67dd6fd1ba67f47c7b147fbb7c12380f' 
  AND token = 'SXcYb8ntLU1DBwU6GWL9KsSEvM0w62anju8rvFTKOK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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