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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1df24c29ebbd69e5895208a1d026f23ba1fa59db956f9095863f5aecf81b800' 
  AND token = 'VTpqUX5AasaWrv16yNSabIq29VZb6xfntNsfLZKESPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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