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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94400c28488c238d3ce91fbdd97c2f1aef8241c5f1a41a058b4195fff07a95d1' 
  AND token = 'DpJDho/8GnxG0QoqaXkb6LTqc4RXwrXmioxly3avwGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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