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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8d03314e37ad88b71504b9436803fd42640e8a6e7c3743966d50ff5f551e64' 
  AND token = 'y6uWXA7GaIYe8kcoqIodJRubCf6NZlgJsWV1I3mo+Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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