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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '863cd103759cd68c62a23af2d9b09d4567107e9bee917dde9ef971a244092e61' 
  AND token = 'mWIS2FOE7FHDdO65qhK0rPooRzN+20BL36I+A4SKWZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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