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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1847fcf273f55da738d6c0755a1c2f435a048cf63326ac1eebe10ac890e7b12b' 
  AND token = 'Vn26rNTBxrqqYZY3JsBTXxIhl6cQrDdZ2IEIu2QT8DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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