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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd9eeb87c44d5a6a547c8b88fe6dc7f6854f4770a5eb817921725e0c9414f96' 
  AND token = 'TD9+BGD64snl8HZp0JVtQaboGyViHNoL3lnGrag7axo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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