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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e3c5a409c83c50695f2a63b3ae3ce09c6109296a88038b5a7cffb635365aa6' 
  AND token = 'B1aYnfY3SP2Kb3kDA5nl6cRkvLgY3byra1Mh7PiOn48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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