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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da4da01e922200893a05c5ad6028855253972a86a8baffc1002cab778a386fc' 
  AND token = 'wWU/INg5Tjym1ag9QECC6ZSzf1DVWPcVWtkZuXn5Zuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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