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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '270bb4f510247e15c3dfff6e2cc7440e1ba48fc5d99f49d87e7ac1d570dad84c' 
  AND token = 'QV96qmPc7Xww92oR5QKh+w//FOTbCu10sPRCGdSEj+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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