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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dabc1b2a878630d1719c960b74d138ea236d77b87dc6a31ae19dbb5a441f5e4' 
  AND token = 'YshSlcLccFgoQttaZ3k49bXnntFOXt79MpwF/d8FxJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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