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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33119aceda7f1e8333f68dfe863829569797e0403465c7326951e93a4e901383' 
  AND token = 'zTlg491FtsbYIcqhStCH4JTVIpf53EmzBnaAZe5Y1fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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