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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5d24129f653fa9936b828e2371cbe5261feac153b708a938c3d16f19a75cd0f' 
  AND token = 'XtIhMWmGtNHfbQnf7u/T1PX0wZ3BWyPysn8Y2004jqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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