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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f71e1a516089158eac91620749c4cfa3ee029c35658fcfb0210bae4dc968a7' 
  AND token = 'zvbnEe33OcndILNBisUajTp4KdpA2TvLREb+dyp2DlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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