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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca025b525353d33cd40c33401492dbf6e64d1d8deb567ab77d3dab415518f7c0' 
  AND token = 'hLXOnJSZeZiiVkaG104K9gA8LRgP6t5wkFNnosXRPo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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