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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8efb8518b454a0ab40d0430d46ec8f91c7199aa0bab48440b4be1d4c077ec2dc' 
  AND token = 'rFi5UbYmEJm1h3v4jbblBl9SrBSegbIPug9IXyI0mCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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