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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d2c922b112de309dfa34376dff27ba991dd5ea98efaa8ade49a25cf6c7790c' 
  AND token = 'HsbtKB3MP4k9NeAvCgLNCwi+aYHdX9szbwtnphhBLc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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