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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e01d01a6afeac09ae84cc8063b47d0710c3360b40fbabfd87d279ca56d1b850' 
  AND token = 'rQ9vA3iZCrZoMfbWze9LvlEfBfmIaaT7Vsjan8eIR5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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