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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c797905fb87ab1cf4d42cbca48a322a4c4707fff4362ad93a01d2a101ed5ad' 
  AND token = 'r7fUVqt0DUlW1ocWHd3TxnkZv0Bq+H0LY9/ajOlYNXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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