SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f152b354d5f6582be733fcb0f073f23695453eb17286ffb2db96475d1e857b6c' 
  AND token = 'ITNaQC8Cyva72vwL1GEQVtnjY8kGzeJ2/N/WZnG5Jhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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