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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc676d8cf9284ba564dd318cfa792ca081065e02a67b77b6c8b1da5aa08d191' 
  AND token = '3bJ9VIj99PWc+e1LKFZy8Qodr3n92hzhJ49rMTt3xKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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