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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '265980911d8b9896d9986ae6f1382dc9ebe140170f72dce13b1d550ccf1edb31' 
  AND token = 'ijF9KKeBqwHD15kJzAc3gLT/JERcr3DsLMvvPmMGoNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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