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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b112d6776a379adb1208958bd460f28b2b6db86c67c02ee60936009d236522d' 
  AND token = 'EY2DcR90J3aGuoAc3xXRGfizl4PnNocS4HYXaaGOFqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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