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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228023e21d03ca96e88da86e3f45ac05d71bd8c89cf042d11f08d73e423f43b8' 
  AND token = 'BDNXlsVtZrg2LrLzgeE59pm67uGs1xJq3qcPEXGNjTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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