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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259d1e75c5368b53d1a5d8ce30ec76d0c84ec1d6b49b5748ad4edf0a18ae6319' 
  AND token = 'sRvt58ozy8kWdEMjul3aa223LLLzeFa+xbHK+mj8daE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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