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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2ad9b267af1be874affe2ab6d4d55e4178623b2ab8cd9cca7ebfb2fda5d2d9' 
  AND token = 'pjQtXlxZKeQ08/UhWi36dz60KBTFGWyowbaSuvORsw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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