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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa595f46b6b4b76ae5f84dbcd4817188a43f9a85d0337e07575497ed149de14f' 
  AND token = 'UDUSHlX+qS2Libz2ZB3jtk9yubyQtSnP401dkm5yiQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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