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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc27993a9b6af5079d409c857b5160faa29a4ffd36d8a284262ba367a3a401a' 
  AND token = 'kId604Q/1uo3IruT5dZ09lL/9TDmCkiM5mODqbiXGh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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