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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fedc644bd65609f3cf0c731a1c8c50656abf109f53b6fbbdcd4ad67640ed19' 
  AND token = 'doqk9XZcfGYu0jcVL8LVVjo2qL1VjmGoRpSAP+if8Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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