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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890935b5f1fd0d54bd085870ba00f938c14c98f845f6c6e28fa8c2ebb31f8914' 
  AND token = 'Rcq0LdwYk6dKWI1kEB2u8obvXYNzCBku0y/+a0426s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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