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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936b23135376fec91d42cc437ae9dd018c11a8db7a06dd3bf932a4ba5950dce6' 
  AND token = 'mgtqoyG6dI0L8d1EJxGT0pRa4Lim1aOJcV35IYnAA6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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